* {
    border: 0;
    padding: 0;
    box-sizing: border-box;
}

html body {
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, #aa4b6b, #6b6b83, #3b8d99);
}

.footer {
    color: cadetblue;
    font-size: 12px;
    position: absolute;
    bottom: 20px;
    left: 50%;
    margin-left: -30px;
}

.form-container {
    width: 768px;
    height: 500px;
    margin: 100px auto;
    background: #F1F1F1;
    border-radius: 10px;
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
    overflow: hidden;
}

.left {
    width: 50%;
    height: 100%;
    float: left;
    background: url(../img/24d5fc7a7999354a2d485d3846d5a90a.jpg) center center/cover no-repeat;
}

.right {
    width: 50%;
    height: 100%;
    float: right;
}

h1 {
    /* 登陆界面标题样式 */
    position: absolute;
    top: 30px;
    left: 40%;
    margin-left: -18px;
}

form {
    padding: 20px;
    height: 500px;
}

input {
    outline: none;
    background: #F3F4F5;
    width: 60%;
    padding: 12px 15px;
    margin: 10px 2px;
    border-radius: 20px;
    border: 1px solid #A18CD1;
    transition: 500ms;
    font-size: 14px;
}

input[type=submit] {
    margin-left: 20px;
    width: 40%;
    background: linear-gradient(to right, #12c2e9, #c471ed, #f64f59);
}

.register-div:hover input[type=submit] {
    background: #6b6b83;
    box-shadow: 0 2px 11px #6b6b83;
}

input:focus {
    box-shadow: 0 2px 11px #6495ED;
}

p {
    background: linear-gradient(to right, #2980b9, #6dd5fa, #ffffff);
    width: 60%;
    padding: 12px 15px;
    text-align: center;
    margin: 10px 2px;
    border-radius: 20px;
    border: 1px solid #A18CD1;
    transition: 500ms;
    font-size: 20px;
    font-weight: bold;
    color: #aa4b6b;
}

span {
    font-size: 5px;
    color: red;
}